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The modified Mitscherlich plant growth model was used to quantify the thresh- old leaf Zn level influencing nut yield and vegetative growth, on an orchard basis, for pecan (Carya illinoinensis (Wangenh.) C. Koch). Four indices of tree performance, including percentage of trees without deficiency symptoms, vegetative growth, nut yield, and trees without deficiency symptoms plus nut yield, were analyzed with regard to leaf Zn concentration. Data available from published and unpublished sources on any single performance index were combined for mathematical modeling. The threshold value for leaf Zn was determined to be ≈50 µg·g -1 for these tree performance indices. Thus, nut yield and vegetative growth in an orchard will be reduced with a leaf Zn concentration below ≈50 ≈50 µg·g -1 , but will not be affected above this value. Rosette, a disorder in pecan resulting from inhibition of shoot elongation, has been recog- nized as a major cultural problem since the early part of this century (Orton and Rand, 1914). By 1932 the disorder was discovered to be caused by Zn deficiency (Alben et al., 1932), but threatened to destroy commercial pecan production during the interim (Sparks, 1987). Symptoms of Zn deficiency may be more, or less, severe than rosette and follow a sequence of interveinal chlorosis, yellow leaf- lets, wavy leaflet margins, rosette, and shoot dieback. The influence of Zn in relation to these leaf deficiency symptoms, as well as proposed threshold leaf values, soil content, soil availability, plant uptake, and correction

Threshold Leaf Levels of Zinc that Influence Nut Yield and Vegetative Growth in Pecan